Will Ferrell is no stranger to rivalries, but although the star might be used to coming to blows with John C. Reilly on the big screen (remember 'Step Brothers' and 'Talladega Nights'? yeah, ya do), it seems like he's taking his act to the small screen with a new nemesis. On last night's 'Tonight Show,' a seriously revved up Ferrell hit host Jimmy Fallon's stage alongside Red Hot Chili Peppers drummer Chad Smith, who just so happens to look startlingly like Ferrell.

That's enough for a rivalry, right? For Ferrell, it definitely is. The pair have been teasing their drum-off for a few days now, and while the the gag has some charitable returns, it's mainly just about these two going nuts on each other behind some fresh kits (while also looking weirdly like each other -- it's all very strange).

Are you ready to see this actual drum-off play out? Cover your ears and prepare for a big surprise.